PROLOGUE
**First book: Wind to Grief Wind to Foresee**
5 years have been gone since the four friends investigation group ever made their first investigation on that haunted Palace. Minji and Hana got rolled into Seoul Women's University. Hwan got into Hanyang University and Hea got into Kyung Hee University. Minji's brother Joon was in Seoul National University.
However, Minji later shifted to Switzerland because she has to take hold of her dad's company. Minji has been studying in EU bussiness school since.
Meanwhile, Hea was finishing her Arts degree in California College of the Arts.
One thing common was that all of them kept their spy name which where Vixiya (Minji), Ariella (Hea), Lorens (Hwan) and Sandra (Hana). Their code name arranged as 'VALS'. They didn't know and haven't talked to each other since after school.
Ariella was back at South Korea after completing her computer engineering degree. She is deemed to find out her friends. Would she succeed?
